Movements of the Vocal Cords

Abstract

Vocal cord movement induced by laryngeal nerve stimulation was compared with that of respiration, phonation and deglutition, and the results of electrical stimulation of the external superior laryngeal and recurrent nerves and their branches in dogs at different frequencies and voltages are described. The posterior cricoarytenoid muscle (abductor) has a low frequency characteristic when compared with the adductor muscles. The frequency characteristics of the cricothyroid muscle (tensor) is between the abductor and the adductor.